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I/O operations with matrices and vectors. The formats supported are:
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<ul>
<li><a href="http://math.nist.gov/MatrixMarket/formats.html#coord">
 Coordinate format</a></li>
<li><a href="http://math.nist.gov/MatrixMarket/formats.html#MMformat">
 Matrix Market exchange format</a></li>
</ul>
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The <a href="http://math.nist.gov/MatrixMarket/formats.html#hb">Harwell-Boeing
format</a> is not supported.
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